User Manual

Curve/Line - (Throttle Curve)
The Curve/Line is the line that results from connecting all of the points together based
upon their point values. The default throttle curve is a straight line that is on a 45-degree
angle. This configuration is said to be Linear because there is an equal relationship
between the throttle stick position and servo movement. If the throttle stick is moved
30% from low, the servo moves 30% from low. This can be observed by viewing the
Throttle Stick position and the Throttle Servo position labeled IN and OUT on the bottom
left of the display – as the throttle stick is moved from low to high, the throttle servo
tracks along at the same percentage. IN represents the throttle STICK position and OUT
represents the throttle SERVO position.
Once one or more point values are adjusted from their default Linear value however,
there is no longer a straight line and the servo may move more or less than the throttle
stick based upon the value of the point. This is how exponential is introduced into the
throttle response. If Points 2 & 3 are assigned values that are lower than the default
values associated with a Linear response, the throttle servo will lag behind the throttle
stick at first, reducing engine RPMs for the lower stick settings. In other words, when a
point value is decreased the engine RPM will decrease when the throttle stick is over that
point and when a point value is increased, the RPM increases. It is therefore a simple
matter of adjusting the point value for a given throttle stick position to increase or
decrease engine RPM when the throttle stick is at that point.
Graph - (Throttle Curve)
The graph illustrates the throttle curve. The X-Axis (horizontal plane) represents throttle
stick movement where the left edge of the graph is low throttle and the right edge is high
throttle. The Y-Axis (vertical plane) represents servo movement where the bottom of the
graph is low throttle and the top of the graph is high throttle. The higher a point is on the
graph, the higher the engine RPM.
Points That Can Be Adjusted - (Throttle Curve)
The points that can be adjusted are listed vertically by name and are also displayed by
number along the bottom of the graph. Use the numbers along the bottom of the graph to
determine which point(s) need adjustment.
Change the value of a point by highlighting and selecting the point name and dialing-in
the desired percentage.
This is how it works. With the engine running and the aircraft restrained, check the
throttle response by moving the throttle stick from full low to full high 1 click at a time.
What is desired is a noticeable throttle change for each click of the throttle stick. If while
moving the stick it seems that the engine should be running faster or slower for a given
throttle stick position, select the point that is closest to the vertical line (cursor) and
increase the value if the engine is running too slow or decrease the value if the engine is
running to fast for the stick position. Making these adjustments throughout the entire
throttle range will result in the desired throttle response.
Exponential - (Throttle Curve)
This parameter smoothes the Curve/Line between all of the points on the graph to provide
a smoother throttle response. The default value is OFF. To turn it on and smooth the
throttle curve, highlight and select OFF and it will toggle to ON.
JR XP9303 Detailed Function Descriptions 52